Umicore

Centre National De La Recherche Scientifique

Hydro-quebec

The University of Texas System

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Rutgers, the State University of New Jersey

Université De Picardie Jules Verne

Specialty Operations France

Le Centre National De La Recherche Scientifique

Universite De Picardie Jules Vernes

Le Centre National De La Rocherche Scientifique

Christian Masquelier

John B Goodenough

Akshaya K Padhi

Kirakodu S Nanjundaswamy

Mathieu Morcrette

Calin Wurm

Sylvain Gwizdala

Pierre Gibot

Michèle Van Thournout

Albane Audemer

Michel Bernard Armand

Michel Armand

Stephane Levasseur

Stéphane Levasseur

Kirakoda S Nanjundaswamy

K S Nanjundaswamy

Jean-Marie Tarascon

Marc-David Braida

Thierry Le Mercier

Philippe Poizot

Sébastien Launois

Philippe Carlach

Laurence Croguennec

Benoit Fleutot

Sylvain Boulineau

Charles Delacourt

Kirakadu S Nanjundaswamy

Priscilla Reale

Akshaya K Pahdi

Nikita Hall

Loïc Simonin

Ömer Ulas Kudu

Michele Van Thournout

The present invention concerns a new method for the preparation of a Li—P—S product, as well as the products obtainable by said methods, and uses thereof especially as solid electrolytes.

Method for the preparation of a Li-P-S product and corresponding products

A method for preparing a NaV(PO)Fmaterial, including at least the steps: a) reducing the vanadium oxide, VO, under a reducing atmosphere in the absence of elementary carbon and in the presence of at least one phosphate anion precursor in order to form vanadium phosphate, VPO; and b) exposing, under an inert atmosphere, a mixture of the VPOmaterial obtained in step a) with an effective amount of sodium fluoride, NaF, and at least one hydrocarbon- and oxygen-containing compound which is a source of elementary carbon, to temperature conditions that are favourable for calcining said mixture so as to form said NaV(PO)Fcompound. Also, a related electrode material, an electrode and a secondary sodium battery using the presented material.

Method for preparing a NA3V2(PO4)2F3 particulate material

The present invention relates to lithium secondary batteries and more specifically to positive electrode materials operating at potentials greater than 2.8 V vs. Li/Li in nonaqueous electrochemical cells. In particular, the invention relates to crystalline nanometric carbon-free olivine-type LiFePOpowders with enhanced electrochemical properties. A direct precipitation process is described for preparing crystalline LiFePOpowder, comprising the steps of: &#x2014;providing a water-based mixture having at a pH between 6 and 10, containing a water-miscible boiling point elevation additive, and Li, Feand Pas precursor components; &#x2014;heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFePO4 powder. An extremely fine 50 to 200 nm particle size is obtained, with a narrow distribution. The fine particle size accounts for excellent high-drain properties without applying any carbon coating. This allows for a significant increase in the active material content of the electrode. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

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The invention relates to materials for use as electrodes in an alkali-ion secondary (rechargeable) battery, particularly a lithium-ion battery. The invention provides transition-metal compounds having the ordered-olivine or the rhombohedral NASICON structure and the polyanion (PO)as at least one constituent for use as electrode material for alkali-ion rechargeable batteries.

Cathode materials for secondary (rechargeable) lithium batteries

The invention relates to crystalline nanometric olivine-type LiFeMPOpowder with M being Co and/or Mn, and 0&#x2266;x&#x2266;1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of: providing a water-based mixture having at a pH between 6 and 10, containing a dipolar aprotic additive, and Li, Fe, P, and Coand/or Mnas precursor components; heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFeMPOpowder. An extremely fine particle size is obtained of about 80 nm for Mn and 275 nm for Co, both with a narrow distribution.

The invention relates to active materials for the manufacture of Li-based batteries. A crystalline nanometric powdered material with formula Li(M, M')PO, in particular LiFePO(O&#x2266;x&#x2266;1), is disclosed, exhibiting single phase Li insertion/extraction mechanism at room temperature when used as positive electrode material in Li-based batteries. Compared to current LiFePO, the novel material results in smooth, sloping charge/discharge voltage curve greatly simplifying the monitoring of the state of charge of the batteries. The coexistence of mixed valence states for Fe (i.e. FeVFe) is believed to increase the electronic conductivity in the room temperature single phase LiFePOmaterial, compared to state of the art two-phase materials. This, together with the nanometric size of the particles and their sharp monomodal size distribution, contributes to the exceptional high-rate capability demonstrated in batteries.

Room temperature single phase Li insertion/extraction material for use in Li-based battery

The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700&#xb0; C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO, phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.

Carbon-coated Li-containing powders and process for production thereof

The present invention relates to crystalline nanometric olivine-type LiFeMnPOpowder with 0&#x3c;x&#x3c;1, with small particle size and narrow particle size distribution. The fine particle size is believed to account for excellent high-drain properties, while minimizing the need for conductive additives. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

The present invention relates to lithium secondary batteries and more specifically to positive electrode materials operating at potentials greater than 2.8 V vs. Li/Li in non-aqueous electrochemical cells. In particular, the invention relates to crystalline nanometric olivine-type LiFeMPOpowder with M is Co and/or Mn, and 0&#x3c;x&#x3c;1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of:&#x2014;providing a water-based mixture having at a pH between 6 and 10, containing a dipolar aprotic additive, and Li, Fe, P, and Coand/or Mnas precursor components;&#x2014;heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFeMPOpowder. An extremely fine particle size is obtained of about 80 nm for Mn and 275 nm for Co, both with a narrow distribution. The fine particle size is believed to accounts for excellent high-drain properties, while minimizing the need for conductive additives. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

The invention relates to materials for use as electrodes in an alkali-ion secondary (rechargeable) battery, particularly a lithium-ion battery. The invention provides transition-metal compounds having the ordered-olivineor the rhombohedral NASICON structure and the polyanion (PO)as at least one constituent for use as electrode material for alkali-ion rechargeable batteries.

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Boves, France

Christian Masquelier